From: Eric W. Biederman <ebiederm@xmission.com>
Date: Thu, 31 Jan 2013 11:40:12 +0000 (-0800)
Subject: ceph: Translate inode uid and gid attributes to/from kuids and kgids.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ab871b903e9095772c219b512d9eae96c4663a5d;p=linux-beck.git

ceph: Translate inode uid and gid attributes to/from kuids and kgids.

- In fill_inode() transate uids and gids in the initial user namespace
  into kuids and kgids stored in inode->i_uid and inode->i_gid.

- In ceph_setattr() if they have changed convert inode->i_uid and
  inode->i_gid into initial user namespace uids and gids for
  transmission.

Cc: Sage Weil <sage@inktank.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 2971eaa65cdc..40e0787022e9 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -612,8 +612,8 @@ static int fill_inode(struct inode *inode,
 
 	if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 		inode->i_mode = le32_to_cpu(info->mode);
-		inode->i_uid = le32_to_cpu(info->uid);
-		inode->i_gid = le32_to_cpu(info->gid);
+		inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
+		inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 		dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 		     inode->i_uid, inode->i_gid);
 	}
@@ -1570,8 +1570,9 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
 			inode->i_uid = attr->ia_uid;
 			dirtied |= CEPH_CAP_AUTH_EXCL;
 		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
-			   attr->ia_uid != inode->i_uid) {
-			req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
+			   !uid_eq(attr->ia_uid, inode->i_uid)) {
+			req->r_args.setattr.uid = cpu_to_le32(
+				from_kuid(&init_user_ns, attr->ia_uid));
 			mask |= CEPH_SETATTR_UID;
 			release |= CEPH_CAP_AUTH_SHARED;
 		}
@@ -1583,8 +1584,9 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
 			inode->i_gid = attr->ia_gid;
 			dirtied |= CEPH_CAP_AUTH_EXCL;
 		} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
-			   attr->ia_gid != inode->i_gid) {
-			req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
+			   !gid_eq(attr->ia_gid, inode->i_gid)) {
+			req->r_args.setattr.gid = cpu_to_le32(
+				from_kgid(&init_user_ns, attr->ia_gid));
 			mask |= CEPH_SETATTR_GID;
 			release |= CEPH_CAP_AUTH_SHARED;
 		}